/**
   * The Asynchronous version of setACL. The request doesn't actually until the asynchronous
   * callback is called.
   *
   * @see #setACL(String, List, int)
   */
  public void setACL(final String path, List<ACL> acl, int version, StatCallback cb, Object ctx) {
    final String clientPath = path;
    PathUtils.validatePath(clientPath);

    final String serverPath = prependChroot(clientPath);

    RequestHeader h = new RequestHeader();
    h.setType(ZooDefs.OpCode.setACL);
    SetACLRequest request = new SetACLRequest();
    request.setPath(serverPath);
    request.setAcl(acl);
    request.setVersion(version);
    SetACLResponse response = new SetACLResponse();
    cnxn.queuePacket(
        h, new ReplyHeader(), request, response, cb, clientPath, serverPath, ctx, null);
  }
  /**
   * Set the ACL for the node of the given path if such a node exists and the given version matches
   * the version of the node. Return the stat of the node.
   *
   * <p>A KeeperException with error code KeeperException.NoNode will be thrown if no node with the
   * given path exists.
   *
   * <p>A KeeperException with error code KeeperException.BadVersion will be thrown if the given
   * version does not match the node's version.
   *
   * @param path
   * @param acl
   * @param version
   * @return the stat of the node.
   * @throws InterruptedException If the server transaction is interrupted.
   * @throws KeeperException If the server signals an error with a non-zero error code.
   * @throws org.apache.zookeeper.KeeperException.InvalidACLException If the acl is invalide.
   * @throws IllegalArgumentException if an invalid path is specified
   */
  public Stat setACL(final String path, List<ACL> acl, int version)
      throws KeeperException, InterruptedException {
    final String clientPath = path;
    PathUtils.validatePath(clientPath);

    final String serverPath = prependChroot(clientPath);

    RequestHeader h = new RequestHeader();
    h.setType(ZooDefs.OpCode.setACL);
    SetACLRequest request = new SetACLRequest();
    request.setPath(serverPath);
    if (acl != null && acl.size() == 0) {
      throw new KeeperException.InvalidACLException();
    }
    request.setAcl(acl);
    request.setVersion(version);
    SetACLResponse response = new SetACLResponse();
    ReplyHeader r = cnxn.submitRequest(h, request, response, null);
    if (r.getErr() != 0) {
      throw KeeperException.create(KeeperException.Code.get(r.getErr()), clientPath);
    }
    return response.getStat();
  }